Sper scientific 850045 User manual

Dissolved Oxygen Pen
Meter
850045
Instruction Manual

TABLE OF CONTENTS
Features …………………………………...…...……... 3
Front Panel Description ……………………………… 4
Measurement Procedures ………………………..…. 7-9
Probe Maintenance …………………….…………… 10-11
Specifications ……..………………………….………. 12-13
Battery Replacement ………………………...….…... 14
Calibration …………………………………………….. 5-6

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 Heavy duty polarographic D.O. probe including
temperature sensor
 Automatic Temperature Compensation
 Microprocessor assures high accuracy
 Dual display LCD
 Auto power off
 IP-67 water resistance.
 Maximum and Minimum
 Data hold
FEATURES

FRONT PANEL DESCRIPTION
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FIGURE 1
1-6
1-1
1-7
1-5
1-2
1-3
1-4
1-1
1-2
1-3
1-4
1-5
1-6
1-7

CALIBRATION
5
Calibration
1. Fill the D.O. meter probe head (completely) with
Electrolyte prior to using the first time. Please refer to
the Probe Maintenance section (page 10) for
instructions.
2. Prior to taking measurements, the D.O. meter should be
calibrated using the following steps.
3. Remove the red protective cover (Fig., 1-7) from the
black probe head (Fig., 1-5). *The small sponge inside
the red cover keeps the diaphragm moist with water.
4. To turn the meter on, press the Power On/Off button
(Fig., 1-2).
5. The LCD display (Fig., 1-1) will show %O2and
Temperature - see example below.
Wait for approximately three (3) minutes until the upper
display value stabilizes.
%O
2
21.5
25.9 ºC

Perform the calibration procedure in an open and well
ventilated area to achieve the best possible results. Once
the calibration is complete the meter should read approx.
20.9 as this is the typical amount of O2 in the air.
CALIBRATION
6
30
CAL
Flashing
Counts down
from 30 to 0
6. Press and release the HOLD button (Fig., 1-3) - the
display will read HOLD.
7. Press and release the REC button (Fig., 1-4) - the
display will show a flashing CAL indicator and the upper
value will change to 30, then countdown to 0 (takes 30
seconds).
8. Once the countdown has been completed, the End
indicator will be displayed momentarily, then display will
return to the normal display as shown on page 3.

MEASUREMENT PROCEDURES
7
Dissolved Oxygen (DO) Measurement
1. Make certain the meter has been calibrated (page 5).
2. Press and hold the Unit button (Fig., 1-3) for at least 2
seconds, the display will change from %O2to mg/L.
3. The meter is now ready to measure.
4. To activate Automatic Temperature Compensation the
probe head (Fig., 1-5) must be immersed to a depth of
10cm. It takes several minutes for the temperature of
the probe and liquid to equalize.
5. For accurate D.O. measurement of any liquid, the probe
should be moving. Make sure that the velocity of the
movement is at least 0.2 - 0.3 m/s. This can be achieved
by shaking the probe.
Note...
To keep errors to a minimum during laboratory
measurements, use of a magnetic agitator is
recommended.
6. Rinse the probe with tap water after each measurement.
7. Re-install the probe head’s protector cover (Fig., 1-7).

MEASUREMENT PROCEDURES
8
Temperature Measurement
1. When not in calibration mode, the meter continually
displays the temperature at the bottom left hand corner
of the LCD in either ºC or ºF.
2. Press and hold the REC button (Fig., 1-4) for at least 2
seconds to switch the temperature unit from ºC to ºF.
Note...
The temperature unit cannot be changed when the meter is
in record mode (when the REC indicator is displayed on the
LCD).
Data Hold
1. While measuring, press the Hold button (Fig., 1-3) to
hold the displayed value. The LCD will show the HOLD
symbol.
2. Press the Hold button once again to release the data
hold function.

Data Record (Maximum & Minimum Reading)
1. The data record function records the maximum and min-
imum readings. Press the REC button (Fig., 1-4) to start
the Data Record function - the display shows REC.
2. Press the REC button: the REC MAX symbol, along with
the maximum value shows on the display.
3. Press the REC button again and the REC MIN symbol,
along with the minimum value shows on the display.
4. To exit the record function, press and hold the REC
button for a minimum of 2 seconds. The display will
return to the current reading.
MEASUREMENT PROCEDURES
9

PROBE MAINTENANCE
Initial Use
1. Unpack the DO meter and fill the probe head with the
Electrolyte (OXEL-03) fluid provided.
2. Follow the steps shown in Figure 2.
Probe Head & Fluid Maintenance
1. Whenever the DO meter will not calibrate correctly or
the DO reading is unstable, check to see if the
Electrolyte fluid is dirty or has evaporated.
2. If the Electrolyte fluid needs to be replaced, refill the
probe head (completely), following the steps shown in
Figure 2 and recalibrate the DO meter (see page 3)
3. If the fluid has been replaced and the DO meter still
does not calibrate correctly or give a stable reading,
check the probe head diaphragm for damage.
4. The Teflon diaphragm is delicate and can be damaged if
it comes in contact with solid objects or if the meter is
dropped.
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